When I was a freshman in high school, we had an awesome geography teacher. He had a great memory and recalled coaching me in wrestling when I was five years old. I didn't recall him, but it speaks volumes he recalled me.
In 1978, this teacher taught the class many things, but two distinctive things stick in my now struggling memory.
(1) Florida was going to collapse with the rerouting of water to make more of the state buildable livable, essentially that the rerouting of the water would introduce salt water into the fresh water-- thus creating a loss of available fresh water both on the surface, but more importantly underground.
(2) that the ice age was going to be returning to earth.
I can't comment on #2, as I don't recall the timeframe he was teaching. But I don't recall global warming as ever a topic.
For #1, Florida has sign massive developments and population increases every year for decades. Not hearing about Florida having freshwater problems on a MACRO level.
Yes, none of us know what the future brings. And it seems most every expert given enough time ends up wrong. Listening to part of the recent Elon Musk interview on Joe Rogan, Elon mentioned that the biggest risk to planet earth may an asteroid hit. Maybe an asteroid will hit next year, or three million years from today- but Elon believes an asteroid hit may equate to the end of the earth being habitable for humans.